Humidifier tub



FIG. 1 is a front perspective view of a humidifier tub for a respiratory apparatus according to our new ornamental design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a rear perspective view thereof;

FIG. 9 is an interior perspective view thereof from the rear;

FIG. 10 is a cross section taken along lines 10-10 of FIG. 4; and,

FIG. 11 is a cross section taken along lines 11-11 of FIG. 4.

Where included, broken lines represent environmental structure and do not form a part of the claimed design. 

CLAIM The ornamental design for a humidifier tub, as shown and described. 